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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e52f8835b6b9520c315d588c60125bebe06fadbbc9dabab0612a70ce409b49' 
  AND token = 'R/jQUnZsDroeskYsUdxFshMAIE7xC8v0xl/ax6JNKBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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