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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ee3d3640fa8e2faf8c6576ee29d9b6e59b241acab49ce1c0491c023b123404' 
  AND token = 'eBqYXQfHY6R7Z2e3I69Cwfa5DMQlloiJD/MCuwCk6DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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