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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b587e1b1d4e6e581899815cc6adc77dc26453c6549571e494e3fd1f0a2959dc' 
  AND token = '69ayJVdbY0nliAUMY9Him27nLFsMsZ7IPs4bfBhlpA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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