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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eedb190356538e30d362f1352e930e791a1b6074ca7dd29fc270de9febf6f1' 
  AND token = '0IoeF5aXuVhe1L4kIZ3xfzFXrrcwmaca24ySPrXMFfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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