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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5a68f5b56049c155e1e1f410b40ba013fa6fcbd291044acf71294fe04efdba' 
  AND token = 'DHzWvkGYGW1I0Zz80m5HXSU5kqek946wSuJrdUcU9vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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