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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bba1fe2e2932eb498c4a8610cb82aa56a884b5515d8adacc1630ea36d5fbb4c' 
  AND token = 'pCBMg6UD6ljOb7YobahbSpwOtQLUjLP5tDfew5ZZkms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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