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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fa8e33d17a6cbea0bbd54b78eec188bd821fe027b39f8c3fbb33a09df737ca' 
  AND token = '0S2VWYxM9JIlwvi9luwDQnPxqp25m8GsTFeyRxAx/MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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