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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c284e7cf96cebbcd33a56ccbb6b6261ca5fd32c21aebc3ec0a6fc94239c79707' 
  AND token = '5dO3J0hjXgc9R1m2Drcl9eur7MylJ5WGI+rUGSg37Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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