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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb6a57f0b91bb3c6234035c1aa0f017036f8097daba43233973307b8a8e1524' 
  AND token = '5v4I7NIRA9N61hpIm9OzoWKG7jPXQtfKcyr+ToUp0Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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