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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f4b43cf0feb65dbeeb80ecd191749d535f679b55baa4ba1468d0df5ea4f362' 
  AND token = 'AkQHBQfCfHnR2YFcvrb6z2/+uq0eLfQnPDJn5jVPYis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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