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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '427f72241f53f24fc180126fedd9b0c886c37e5b98f7570a3526df3f58f8edf3' 
  AND token = '8tVWNer8ZtKNKKpy/DG1V13M/1iW8xeONCCmt1UF96E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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