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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13dc0cdca4ced3ed914e380839688325e03bc47289b0476adb28143453fd795' 
  AND token = 'fyiDq/zZelmkk3XshlzbVPQwEUCruE5/1g9cBjezUQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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