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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ae04419219b843d7545aeee81e08ea84ba51dd25e2ff480f406670267e8b49' 
  AND token = 'NgoVdHYt0L40e2cwBKQ+ZpXXldtFhT67SxZxV4FC7t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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