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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f639c8760a8e7695e886ef0d20678bc34a5f57c8e7820be7389afbe515f158d9' 
  AND token = 'B/HPr3WVME4jqlpxfKom30w0VUSH6GFyyaXzmNg6z2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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