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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a30349b647a9be8608e6beea1776c3c857ccd54dd8c6d8b87a19a55b233a9e' 
  AND token = '8FpgCB4vCTbbEAbrsnt/0ulkSoMCQKZgX1Wsb0Kiazk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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