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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3232418d22c5999daf9d4332b60a5cd25c7b575a6cb256c66c05d3d59bda448c' 
  AND token = 'ofGTc59jhdQ9Fo2kxwN+8lwjEloNXBZ0SJ97L21viSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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