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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41bb2de39c7cf17c81740ce39e1e48347f55fcb99ed84b4ee388eefc3b5a07e' 
  AND token = 'jkPDur5HDX+G4h4suzKHGQIl1jA1CQyp138NdJevG38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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