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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8836923b4e04fe0f59fd61b8c687e654b1201a313ecf74d122615ab484a4fdb' 
  AND token = '1ktD0Vh88TniJOw5TVRky0Y8IdS0o3O18dM3o6Yq0m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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