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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412b89ef79ef96d4bc16eb3e8c813cb608ff67f679892d6384cfa4230b9b9476' 
  AND token = 'n0+xAp7cGM6Foqw4ZjS/yVG/fp5bYsi9IcKTRDtjJG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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