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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d7197b1c9e240e21fadce5323327fa285aca7168ed5ab5d7500b1301eeeb68' 
  AND token = 'yS/dMJE1WuD4s63zDWnmppchAwXID56vHriZEX1kpGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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