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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4605da26ec509f9edb577b1dace10e46be627e8120c5ca4f2205a6d3a68190ad' 
  AND token = 'X8DLGZgnh/Z0mW5Em3zlD/z0brJv24Jh7AGXgsHyezk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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