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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b00ef38bcc2c4c33d5445c56dd0c8090378b3a7ce3b5419cd9afc737409cff' 
  AND token = 'yTza+walMl95DDgmG1D8SAQrALS8BSOR9na0omx+NRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}