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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be35953096b9a34a02f9f5b569dbbb275f10458832a1ddee772d41a71fa3dcb' 
  AND token = '8qP2Sy7pFulm0t9xz69NUuVuc93P1KAQr/XJF885Mq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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