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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d79e6978285904ea6ee551ae704fd5817ad62722b19847bce3ae63329dba31' 
  AND token = '8VAkzYoEkNR0WZapEW73zVQquMPCf76Ca2Mu3wYqhx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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