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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93291a6af2ece9a1271304e2db42d56b3d49181d1af85e00b79bf00c9d74c0c' 
  AND token = '5BpnS4ZrSffXm6gHqZASaZ9wl8v0J2ptiiPsQgC7Khw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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