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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0f3af5c985bcaa25894901c110ac46af743b96e03fb6cc6bcde67c64a02cea' 
  AND token = 'x3BDuOHgY7QpTASz1DH6rZIPRc3H0D2VreqXjnPkYxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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