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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4fe5f0ffd8662f53d83edb9bc37a16a55731dbb64963df9868c22e4fee276d7' 
  AND token = 'F1TbFS/mBTo5A1l6JNx33YRprjHmbo+4sCSq9yQoAQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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