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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93100d2eac079e15149396be98b272577a74b3767691f91c37fe91c055b7188e' 
  AND token = '9rwrZo4ISpm/E+OjDLA0rUNCNgTJwXQtyHQtmrRQnQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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