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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c90f704be28e76fdba7242dc38de86c258fe33b27c1a6e3856be0edc3d130d' 
  AND token = 'X+02F0lysntSWHsAsbDZJNp4BV8GbS64uu/Ic8bMrCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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