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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b7ce02e2591bededc7fafcfe562d64f3a4551218175de30823d642942aae73' 
  AND token = 'ni436vsbS3AfxugLfP8J9AwtLjr/jsXgVkBPOLRDsxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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