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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830daf9fad47c4ef778df69abeeb6a338ca69ad095a9c64918897f10dd786bdc' 
  AND token = '7IPivzy17KlRl0uBKttwJeOHmQuGH/iZ3ObS2XhmUTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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