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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd083141ffbeac50ade5c837528e2803f44fca4958c24f07d231b2aadec790263' 
  AND token = 'xQ2ulmBkN9qxVkLJqoy2ZIu+eI395edcdkHNOgy87R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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