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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cdd5b93f5c07f34f84e5b682ee04f79f4595c94bd6368acf7e6724ab065fc4' 
  AND token = 'iAuZnRsgC2xftW4UOap2WFnRwAHjY+FLCJY2HkoT3JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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