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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8386899842669b6ec978de6468e10d362ce5958675c512df9f924e7ceddd63' 
  AND token = '7yU8jSFK8Poqzugee+dUBCZVqjo0ARhKtCQSONyeeKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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