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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a4a95b556c55452e8d60712b0ea09dd496aabf7fa33c066f588fb830d4cf84' 
  AND token = 'sRkqdkrH9a22QImYCiEx6IYaCx5v/nvJb7KU0FhZ8PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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