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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2f96868d085ac8e347dbe0ecc1218a04cd87faafa0eec086398782a07e8e93' 
  AND token = '1IIzm0LSY/9Yd2GbeqpBGWxTs8yF/2LqGpGYPJvO1pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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