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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f83fac8f24607d30df722b31015cdd37009a62115c0fc21107f22ce1f67513e' 
  AND token = '5Hl+9Ra997cEfHG42jGIcMFFBQPtQ/xNgo4kluJeHQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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