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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5861c06c1b41ddf2544eba110e214d770e238d20bc626a665d3e4e1447912e53' 
  AND token = 'MNws0wXvYWldKLrzWz7YesUtprzTS/I7iP5XO5jMhVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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