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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad9db04008ae3eef59da5400671c22e55f1de374e6c29a767fe72c03281e9aa' 
  AND token = '5ChOznxncum0t1a4ML3Jsud5SbaS9yWGF7ulhRrexsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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