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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764ede679c5c9b8ddfacafd7ac890e26bf9b525595f5b7d67f89c40b969768d9' 
  AND token = '7cydmLDwPfHF7S/aMbJxert5ZKGebeXnbsBtUJgnke4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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