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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db71f3d0f8a0c0f6c56543d9cad3eb3cfb7300909434093c0282ef6fb6b8230f' 
  AND token = 'kpg/CHS0lAy0cdFe8pJI4egrq96oXR9VMJDfVo8bAmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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