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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd79894d648bf6450009f084af02223403c838f33245e7cbceb6e85ac2b5b4c' 
  AND token = 'qEm40MoOZVK2P1xlndXaGgnHhiTGVwG0JK8rvtrV12I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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