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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e722564162a7a2f4092bf2453188d3aa3bf3f9371e6c05e0f4b62ec5ba1596b' 
  AND token = 'ycc/xTam7YaTUMH5V3LkbjtFu3ti0qTZH2nSfX8f7Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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