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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d95b168fdbdcff6625aeca09b896d50097a5becb5281e82779be5737b2ae898' 
  AND token = 'aMJYDqMVkGXL7C/ia9iu5t7JIwqjT7CXX+/8vUFkskQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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