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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87be9cee4899a814c8686a8ef4ac4e05905fe0e519f8d4a2bf7cac9c45e85100' 
  AND token = 'UYxavqxdbaBaqm1gv3+gYO/srkatwOpsvScvuFkGzfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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