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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7447cad57909b7e151610d7207d326a74a54c4c07b911aec850fd60a8812b6ed' 
  AND token = 'wmlvLzVUo/7tfLINTunOhyh27D5Mic2g3MoLbw7XopY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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