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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bcb07f183a111976ccf69a487fcf225f4f96a9ea440c28ab57a8c3c652fed1' 
  AND token = 'jNiqjqV/wSsoc3xIbzKsP93Kc05znESQldiTaQ149KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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