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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b984b9d49be11ce8dfd1c9db76e94cc478145aa3da9d1bfbdec6e154e8f80d' 
  AND token = 'RbYnyw59ppi8sva9lYDrG7cJTaDPoCNV3ome5J77ugU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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