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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72072a8adea368838de19fb41365769b2f4301a69a923d4715b9347d59c11e8b' 
  AND token = '8W4zLXieyTrMV1tBv9cXrFGliQdFYLZyxiscdmvn9Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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