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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114bfc05ea91b7dc8e01cc40b8ca1f756bddc22b67b554eb1ca6cae0ead9f36b' 
  AND token = 'vTH+UlCxYR7tDT3rzAJ62l1rCfvF67gkLYfn9P48i+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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