Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e9e7e248d7f9c061eda74badefca81ea4808def0222535b37e2ca9a06dffff' 
  AND token = 'VSiopSMI45u741e982y+8lTrvufQtPcLIMM8cdMXqKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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