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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007618ac27573c9b7a52c278f824ca4ce8113273928370266d01e473fd79218b' 
  AND token = 'iyflssYaep216EG3fua6qq5+NlX8l3Mk/ByXYq3LTKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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