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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65996c387102d658f34f2d9496d43851fcda6af8576e1d35a61dd424200c593c' 
  AND token = 'v0Z+4DBfyWoHNUjwprt/cY5IzlEi1UpJtDjtyfw4Hgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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