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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaf905b6e02e5fca1965f13ed0af1774265a56808316bd65e743ed6f24b5d3f' 
  AND token = 'HxTunfryTkGwehOt8GQSxYvJoi+ilkqtb9Hj9z5CIb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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