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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a19b7d5892b513c9adb5fad6cc29cd76d922d02cf585ab8e817b7c93d27cc0' 
  AND token = 'mvQSyE/LIdnjLynlDy7KuMVlyVjXfJUjce8jvEOXdOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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