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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d08f4c149837fa38eb90a9a5fcc9034971cb30668c1f1cc683d5a7bab0d7bc7' 
  AND token = 'iLP067f/q01mk2ud3FBo11kWJi+4aRZMsXm++yUeu4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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