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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07f230679d0c7eaf008fcd063534a41c7e543acb8917b6b9a73c6384a504ada' 
  AND token = 'GTqK3gC8UiYQMNa0FIANEi0IcskfJ64a7gvBtAOzWlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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