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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd757a4fe89e59bbb50073f94a70a58c998106331536a7d2ee8c9fbf6a048c2' 
  AND token = 'k69gTfAQnBei4oLwgUQPWkmOd0wTf82dmsDkostlUgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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