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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c19fc3ad4527816a44477181fe6bd20c2875cd03273bb41a1ef4a74d0aaa200' 
  AND token = '7gRI1I4cOXVlBrv3EmDhIGQFVF9Z26UQJ6l8b0AfHS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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