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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e460976fa9fca293991751116079d360801806d9ec902c3bb132f51483e5a4' 
  AND token = 'np0dzLgaMgDgr+N4Vp4+BUdwKY7MdcyK3qcW+1lqe4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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