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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e87979941c3a08378992f4e8b7776d178267d1e0bbf02db7af0c758ccb32b0e' 
  AND token = 'f5iaoS42MuuUkM1Zb9Or2qcdzQdtnOrIzuhJKiydRFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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