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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d196e3bcb68b924f0b87c31e93ddea6eeb0e6c8732d8187c50311fcbec4eaad' 
  AND token = '2uriKyIdcWwi8LENCzLe2eDYtFjgQlQwULWF/K+yl8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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