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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aca034aac148532f887ce997e0d9785182e53f7ae0eed0dde36c9ef7f129708' 
  AND token = 'qfUQUtSOCICuj1jTLyQGx+4fXvoMIqQsUP21O4svYgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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