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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaf9fd5e9561b123cb33e983f860da9d347ea259e432e41b07199b91d050b1f' 
  AND token = 'L6+KFFN1nEBnucAz+kORwiU9wK+mfrV5F8EpAMB1llM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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