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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ae02959a79280c79255a017b97a88dd22d21900fc2fafbc0b6ad43c114bd94' 
  AND token = 'gtuUXG1Y+P9rogsIjDA09P+stwZZG8pcwgOlOeRm3fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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