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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96ac10babe04f6724ae678474a3d9588c4eb8e68598db7b6329c9e7ff716cb2' 
  AND token = 'WF+9Q4vW/oXqUfA4wNOkBCR88fKU+lTtQkjHaA9b+sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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