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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cfc6536d5af06b5c11524bda3eaad444076aec1b7c4006c3a4943587b12f6b' 
  AND token = 'GHBAJ/MqxnRWFrKn0MgWdWTcbccLCOzILqIDRQ7BvO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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