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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c42b4ddd3279b47eac5dc4848dfe44af6448bf207d79a15697259ca0655334' 
  AND token = 'RxBqM3XUfDFi1qGZUkiUdZx2uUHgxYeEolmh2Qw3/eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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