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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231ae162a64fd9631574906e1aeef609809c9eaf5fe65ea3be723c04b345cf5a' 
  AND token = 'BrxQtNUJNO7Nsk+tlaPiK8W+jY9DdjXg87eGG9iUTuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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