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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f4154437d3ad1cbb071c5f3c41bbbc1d0e903e6e53766c4c635b514a0cdc45' 
  AND token = 'EJ7HJBlbwKqBCoSR6lIW4RKjwRunfzfBPW4yFVNAgFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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