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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea5efbd0f918e36c8c5c39e09571ac1cd1b8364b0add7bca7ecd4f04176d32e' 
  AND token = 'bU/RW7UrbtfS6/EdvmtuN7xULITmYOzJirkrG37jJ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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