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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c550f7fa8c942d5368fc5955cb6fbe6ccda525de44c77cc9f6fa6dd2c76e4fdf' 
  AND token = 'nTKV8nsflTTQUjs5fROFP69SF5DU2XjMj9xgLOtqe3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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