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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47844b8e829cbf23b2e786c81b3cf9621f5ebed08eeb2e0336545117cc21efa2' 
  AND token = '0Ru9aqZwr0QpOXQkzC5zVj+IS+EleBQjr7Sfu7Gx9gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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