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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8aaffaaa1deba3ce3e549e761f605ef8f694a0714b3b58088ea0c9f977199b' 
  AND token = '4/n3OUqoja6p/rvcarSz/QaILxKVCvx6p1eunDC6WRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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