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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de4ca25de3d321748a3b6cc12723f31d2bdcff94169dfc79564757af6b4e129' 
  AND token = 'QT0K6g5eVWoY8+yHqfx2FI+GJqOdFIBW2er930SFpu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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